CN106054091B - The method for demarcating non-crystalline material GMI performances using earth's magnetic field - Google Patents
The method for demarcating non-crystalline material GMI performances using earth's magnetic field Download PDFInfo
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- CN106054091B CN106054091B CN201610367377.XA CN201610367377A CN106054091B CN 106054091 B CN106054091 B CN 106054091B CN 201610367377 A CN201610367377 A CN 201610367377A CN 106054091 B CN106054091 B CN 106054091B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1253—Measuring galvano-magnetic properties
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Abstract
The invention discloses a kind of method for demarcating non-crystalline material GMI performances using earth's magnetic field, step includes：1) non-crystalline material being calibrated is driven using alternating-current voltage source, and concatenates divider resistance for the non-crystalline material being calibrated；2) it rotates the non-crystalline material being calibrated along the horizontal plane under the conditions of unmasked, records peak-to-peak value maximum value, the peak-to-peak value minimum value of the non-crystalline material output voltage being calibrated；3) the voltage Vs exported when the peak-to-peak value maximum value being parallel to earth's magnetic field as the non-crystalline material being calibrated, the voltage Vp exported when using the peak-to-peak value minimum value as the non-crystalline material being calibrated perpendicular to earth's magnetic field calculates the sensitivity for the non-crystalline material being calibrated according to formula (1).The present invention has independent of magnetic screen environment, and calibration, the advantage that calibration accuracy is high, method is simple and reliable can be realized using earth's magnetic field under the conditions of unmasked.
Description
Technical field
The present invention relates to the brain magnetic signal acquisition devices of brain-computer interface technology, and in particular to a kind of non-using earth's magnetic field calibration
The method of brilliant material GMI performances.
Background technology
In magnetic measurement field, GMI Magnetic Sensors are because of its wider measurement range, higher limiting snesibility and its side
It is easy use and be widely noticed.GMI effects are exactly the silk or band when soft magnetic material (being mostly Co bases amorphous and Fe base nanometer crystals)
Pass to alternating currentI ac When, alternating voltage that material both ends are inductedUwWith the external magnetic field added by silk longitudinal directionH ex Variation and it is clever
The phenomenon that quick variation, its essence is the impedances of non-crystalline material itself with the sensitive variation of externally-applied magnetic field.By signal acquisition coil,
We can convert impedance value to voltage value, to realize external magnetic fieldH ex Measurement.
In the measurements, the impedance property of non-crystalline material itself sensitivity final to sensor has decisive influence.Assuming that
Under 50 μ T changes of magnetic field, voltage output variation in the case of no amplification of GMI materials is 100mV（Exchange peak-to-peak value）,
Then obtain the sensitivity of 2 mV/μ T.If 100,000 times of the voltage amplification of 2 mV of amplifying circuit pair, so that it may with obtain 200mV/
The sensitivity of nT, i.e. 20 mV/100pT.Assuming that target signal to noise ratio be 5, then amplify 100,000 times after casacade multi-amplifier voltage it is defeated
Going out noise should control within 4 mV, that is, input noise should control within 40 nV.And current input noise is most
In 200 nV, this requires the output of material variations to be further added by 5 to 10 times for more controls.To, it is desirable that we can quickly screen
The performance of different non-crystalline materials, to find the material for meeting demand.
Existing non-crystalline material test method, it is necessary to which the magnetic field offer mark for giving size is provided using Helmholtz coil
Determine benchmark, and requires test that must be carried out in magnetic screen environment.
Invention content
The technical problem to be solved in the present invention：For the above problem of the prior art, one kind is provided independent of magnetic screen
Calibration can be realized using earth's magnetic field under the conditions of unmasked in environment, the utilization earth magnetism that calibration accuracy is high, method is simple and reliable
The method of field calibration non-crystalline material GMI performances.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A method of non-crystalline material GMI performances being demarcated using earth's magnetic field, step includes：
1）The non-crystalline material being calibrated, and the non-crystalline material concatenation partial pressure electricity to be calibrated are driven using alternating-current voltage source
Resistance；
2）It rotates the non-crystalline material being calibrated along the horizontal plane under the conditions of unmasked, records the non-crystalline material output being calibrated
Peak-to-peak value maximum value, the peak-to-peak value minimum value of voltage；
3）The voltage exported when the peak-to-peak value maximum value is parallel to earth's magnetic field as the non-crystalline material being calibratedVs, will
The peak-to-peak value minimum value as the non-crystalline material being calibrated perpendicular to earth's magnetic field when the voltage that exportsVp, according to formula（1）It calculates
The sensitivity for the non-crystalline material being calibrated；
K=（Vp-Vs）/B（1）
Formula（1）In,KIndicate the sensitivity for the non-crystalline material being calibrated,VpIndicate the non-crystalline material being calibrated perpendicular to ground
The voltage exported when magnetic field,VsIndicate that the non-crystalline material being calibrated is parallel to the voltage exported when earth's magnetic field,BIt is big for earth's magnetic field
It is small.
Preferably, the step 1）In when concatenating divider resistance for the non-crystalline material that is calibrated, the non-crystalline material that is calibrated
AC impedance, the ratio between the resistance value of divider resistance be more than 1:10.
Preferably, the earth's magnetic field sizeBValue be 50 μ T.
The method tool that the present invention demarcates non-crystalline material GMI performances using earth's magnetic field has the advantage that：The present invention uses exchange
Voltage source drives the non-crystalline material being calibrated, and concatenates divider resistance for the non-crystalline material being calibrated；Edge under the conditions of unmasked
Horizontal plane rotates the non-crystalline material being calibrated, and records peak-to-peak value maximum value, the peak-to-peak value of the non-crystalline material output voltage being calibrated
Minimum value, the voltage exported when the peak-to-peak value maximum value is parallel to earth's magnetic field as the non-crystalline material being calibratedVs, by institute
State peak-to-peak value minimum value as the non-crystalline material being calibrated perpendicular to earth's magnetic field when the voltage that exportsVpAnd calculate be calibrated it is non-
The sensitivity of brilliant material has independent of magnetic screen environment, calibration can be realized using earth's magnetic field under the conditions of unmasked, marks
Fix the advantage that exactness is high, method is simple and reliable.
Description of the drawings
Fig. 1 is the basic procedure schematic diagram of present invention method.
Fig. 2 is the measuring circuit principle schematic of present invention method.
Specific implementation mode
As shown in Figure 1, the present embodiment includes the step of utilizing earth's magnetic field to demarcate the method for non-crystalline material GMI performances：
1）The non-crystalline material being calibrated is driven using alternating-current voltage source, and concatenates divider resistance for the non-crystalline material being calibrated
R1, referring to Fig. 2；
2）It rotates the non-crystalline material being calibrated along the horizontal plane under the conditions of unmasked, records the non-crystalline material output being calibrated
Peak-to-peak value maximum value, the peak-to-peak value minimum value of voltage；Referring to Fig. 2, it is grounded respectively using oscillograph in the present embodiment, non-crystalline material
It is minimum with the peak-to-peak value maximum value, the peak-to-peak value that detect non-crystalline material output voltage between divider resistance R1,3 points of voltage source
Value；
3）The voltage exported when the peak-to-peak value maximum value is parallel to earth's magnetic field as the non-crystalline material being calibratedVs, will
The peak-to-peak value minimum value as the non-crystalline material being calibrated perpendicular to earth's magnetic field when the voltage that exportsVp, according to formula（1）It calculates
The sensitivity for the non-crystalline material being calibrated；
K=（Vp-Vs）/B（1）
Formula（1）In,KIndicate the sensitivity for the non-crystalline material being calibrated,VpIndicate the non-crystalline material being calibrated perpendicular to ground
The voltage exported when magnetic field,VsIndicate that the non-crystalline material being calibrated is parallel to the voltage exported when earth's magnetic field,BIt is big for earth's magnetic field
It is small.Earth's magnetic field sizeBSpecifically refer to the earth's magnetic field size of testing location, it is however generally that, earth's magnetic field sizeBIt can 50 μ T of value.?
On the basis of the sensitivity for obtaining the non-crystalline material being calibrated, you can carry out GMI effect spirits using to the non-crystalline material being calibrated
The measurement of sensitivity screens out ineligible non-crystalline material.
While it is noted that the AC impedance of non-crystalline material itself is also an important indicator.Too small exchange resistance
It is anti-, in order to meet electric current（Operating point）Constant condition, divider resistance R1 must be as big as possible, to the intrinsic standoff ratio of non-crystalline material
Example is too small, causes in spite of very high sensitivity, is but still not enough to generate sufficiently large changing value.Therefore for non-crystalline material
For, sufficiently large sensitivity and AC impedance are to meet use condition material（Generate enough voltage changes）Important finger
Mark.In order to reach above-mentioned target, the present embodiment step 1）In when concatenating divider resistance R1 for the non-crystalline material that is calibrated, be calibrated
The AC impedance of non-crystalline material, the ratio between the resistance value of divider resistance R1 be more than 1:10, if the ratio is less than 1:10, then
Non-crystalline material will be considered and be unsatisfactory for requirement.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of method for demarcating non-crystalline material GMI performances using earth's magnetic field, it is characterised in that step includes：
1）The non-crystalline material being calibrated is driven using alternating-current voltage source, and concatenates divider resistance for the non-crystalline material being calibrated；
2）It rotates the non-crystalline material being calibrated along the horizontal plane under the conditions of unmasked, records the non-crystalline material output voltage being calibrated
Peak-to-peak value maximum value, peak-to-peak value minimum value；
3）The voltage exported when the peak-to-peak value maximum value is parallel to earth's magnetic field as the non-crystalline material being calibratedVs, will be described
Peak-to-peak value minimum value as the non-crystalline material being calibrated perpendicular to earth's magnetic field when the voltage that exportsVp, according to formula（1）Calculating is marked
The sensitivity of fixed non-crystalline material；
K=（Vp-Vs）/B（1）
Formula（1）In,KIndicate the sensitivity for the non-crystalline material being calibrated,BFor earth's magnetic field size.
2. the method according to claim 1 for demarcating non-crystalline material GMI performances using earth's magnetic field, which is characterized in that described
Step 1）In when concatenating divider resistance for the non-crystalline material that is calibrated, the AC impedance for the non-crystalline material being calibrated, divider resistance
Resistance value between ratio be more than 1:10.
3. the method according to claim 1 or 2 for demarcating non-crystalline material GMI performances using earth's magnetic field, which is characterized in that institute
State earth's magnetic field sizeBValue be 50 μ T.
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| CN110693495A (en) * | 2019-09-11 | 2020-01-17 | 杭州祝和科技有限公司 | High-precision magnetic vector detection device and method |
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| CN201590184U (en) * | 2009-11-30 | 2010-09-22 | 河海大学 | Experimental facility of giant magnetoresistance effect |
| DE102010062237A1 (en) * | 2010-12-01 | 2012-06-06 | Robert Bosch Gmbh | Method for calibrating magnetic field sensor used in automotive industry, involves determining sensitivity of sensor based on difference of strengths of magnetic field applied to magnetic field probe and difference of response voltages |
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